By Kim Jae-heunK-pop singer Roy Kim was booked for sharing sex photos in a chat room where another singer, Jung Joon-young, uploaded his own illicit videos, the Seoul Metropolitan Police Agency said, Thursday.Police have requested Kim, who is studying in the U.S. to return to Korea for questioning.They said they have not confirmed whether the photographs were taken by Kim, as was the case with Jung.Earlier the police transferred Jung to the prosecution for sharing at least 13 sex videos he took without the consent or the knowledge of his partners, in the same chat room.Other singers, Seungri of BIGBANG and Choi Jong-hoon of FT Island, are also undergoing police investigation over alleged sharing of illegally recorded sex videos. Those singers involved allegedly shared the photos and videos in 23 group or one-on-one chat rooms. Sixteen people participated in the group chats and eight have been booked so far.According to police, other celebrities inclduing Kangin of Super Junior, Jeong Jin-woon of 2AM, Lee Jong-hyun of CNBLUE, Yong Jun-hyung of HIGHLIGHT and model Lee Cheol-woo were in the chat rooms. Lee Jong-hyun and Yong have undergone questioning already and police have stated they have no plans to interrogate the rest. Meanwhile, police said Choi admitted to attempting to bribe a police officer when he got caught drunk driving in February 2016. According to one of the chat room members, Choi said he had suggested between 2 million won to 10 million won in a joking manner at a drinking party. But both the officer and Choi claim they do not remember the amount, police said.